Athletic performance depends on athletic ability as well as body build. Training is a crucial factor for success. For this training, knowledge of initial levels of fitness as well as body build both is important. Physical training alters body build as well as internal physiological system in athletes. The main purpose of this study is to provide categorization of different lung capacities in trained athletes according to their body build. One hundred forty eight trained male athletes participated whose age was between 10-20 years. They were classified into endomorph, mesomorph and ectomorph. Different lung capacities were measured. One way ANOVA was done to compare three body types. Scheffe’s post hoc test was also performed. Lung variables such as SVC, FVC, FEV1 and PEFR are found to be significantly different among endomorph, mesomorph and ectomorph. SVC and FEV1 was found to be significantly highest in ectomorph and lowest in endomorphs. It might be due to least amount of abdominal fat and stature. FVC and PEFR were found to be highest in mesomorph and lowest in endomorphs. Mesomorphs possess maximum muscle mass and so highest FVC. Significant differences in SVC, FVC, FEV1 and PEFR indicates somatotypes have definite role in different lung capacities among trained athletes. It reflects that somatotypes should also be considered during assessments of different lung capacities in trained athletes. Endomorphs have poorest lung capacities. It might be due to more fat accumulation in their body.